Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Remixed from a drawing in 'Incidents on a Journey through Nubia to Darfoor', F. Ensor, 1891.
Source Firkin